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. A bucket pump is in the form of a piston roughly resembling a bucket with a one-way valve in the middle, hence the name. (Some versions had two valves). This was also known as a drawing lift and would be mounted above a valve box known as a clack box. On the upward stroke the valve in the piston would be closed so water would be drawn upward, the lower clack valve would open allowing water to be drawn upward below the bucket pump from the sump at the same time. On the reverse stroke the piston valve would open and the water would fill the space above the lift, the clack valve being closed preventing water from flowing back into the shaft sump.
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